Popgoes the Weasel

during the day popgoes is a friendly animatronic that is portrayed as being friendly, positive leader of the other animatronics but however, during the night his personality changes into a more predatory one this is because of the vengeful spirit taking control of the animatronic during the night when most of the animatronics are in free room and are allowed to move off of the stage

Popgoes the Weasel lore centers on an animatronic mascot created by Fritz Glade for his daughter Bonnie, evolving from a dream-fighting scarecrow into the leader of a band in The Popgoes Pizzeria and later a hero in the POPGOES Arcade games, battling evil versions of Freddy Fazbear to save the forest from corruption and immortality, featuring themes of technology, nightmares, and a connection to the original Five Nights at Freddy's lore via Popgoes' top hat.

Popgoes isn't directly "possessed" but is manipulated by the spirit of Bonnie Glade (a deceased girl) via the WeaselWare system, causing him to print parts for Blackrabbit, a vessel for Bonnie's spirit, leading to murder and chaos within Popgoes' pizzeria, particularly in POPGOES Evergreen where he tries to build Blackrabbit to save Bonnie

Popgoes, during the day, is a multitasker. He is programmed to do the most out of the main four that are still connected to WeaselWare, most likely due to the fact that he is the main mascot of the pizzeria. He entertains, cooks the food, cleans the place, and even helps Fritz out during the day

As the name suggests, Popgoes the Weasel's design is based on a least weasel. Unlike the Toy animatronics, Popgoes and the rest of his bandmates have quite realistic colours, and some realistic body proportions, corresponding to the animals that they are based on. Popgoes himself has desaturated brown and beige colours, as well as some especially small legs, which mirror the anatomy of a weasel. Popgoes also has a top hat which is implied to be the same hat worn by Freddy Fazbear, bought by Fritz Glade at an auction held at Fazbear's Fright. He also has a microphone, but he isn't seen visible with it unless he's on the Popgoes Pizzeria stage.